I was there in September of 2002 - 18th-24th and it was HOT and HUMID!! Did I say it was HUMID???!!!!!!!!!!!! I'm from Texas and I thought it was really HOT and HUMID, of course, you do get an afternoon rain shower also.
I usually go in late Sept early Oct and I can tell you it's usually pretty hot!! Of course there's always the good news of the hurricanes going through about that time too.......
I live in Florida and it is still hot and humid in Sept. with afternoon thunderstorms- basically its just like July and August. It doesnt cool down untill late October if even then.
We have been the last 3 years the last week in September and its just plain hot. The humidity last year 04 was made it even hotter. So pack your hot weather clothes :cool1